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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 2 — Jan. 18, 2010
  • pp: 1586–1599

Non-iterative imaging of inhomogeneous cold atom clouds using phase retrieval from a single diffraction measurement

D. V. Sheludko, A. J. McCulloch, M. Jasperse, H. M. Quiney, and R. E. Scholten  »View Author Affiliations

Optics Express, Vol. 18, Issue 2, pp. 1586-1599 (2010)

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We demonstrate a new imaging technique for cold atom clouds based on phase retrieval from a single diffraction measurement. Most single-shot diffractive imaging methods for cold atoms assume a monomorphic object to extract the column density. The method described here allows quantitative imaging of an inhomogeneous cloud, enabling recovery of either the atomic density or the refractive index, provided the other is known. Using ideas borrowed from density functional theory, we calculate the approximate paraxial diffracted intensity derivative from the measured diffracted intensity distribution and use it to solve the Transport of Intensity Equation (TIE) for the phase of the wave at the detector plane. Back-propagation to the object plane yields the object exit surface wave and then provides a quantitative measurement of either the atomic column density or refractive index. Images of homogeneous clouds showed good quantitative agreement with conventional techniques. An inhomogeneous cloud was created using a cascade electromagnetically induced transparency scheme and images of both phase and amplitude parts of refractive index across the cloud were separately retrieved, showing good agreement with theoretical results.

© 2010 Optical Society of America

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(100.3010) Image processing : Image reconstruction techniques
(100.5070) Image processing : Phase retrieval

ToC Category:
Image Processing

Original Manuscript: November 10, 2009
Revised Manuscript: January 6, 2010
Manuscript Accepted: January 9, 2010
Published: January 13, 2010

D. V. Sheludko, A. J. McCulloch, M. Jasperse, H. M. Quiney, and R. E. Scholten, "Non-iterative imaging of inhomogeneous cold atom clouds using phase retrieval from a single diffraction measurement," Opt. Express 18, 1586-1599 (2010)

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